quite a speed boost happened when I switched to SSDs (have OS and data separate).
What puzzles me is that on some occasions when I open Win Explorer, the response is sluggish, WE is not responding for about six seconds.
It reminds me of a regular HDD that has gone to sleep. Not sure if that is relevant for SSDs, but on my machine the power options for HDDs say 60min for going to sleep.
I have this on both machines with SSDs, a Win 7 and a Win 8 machine. AHCI enabled.